Asynchronous Programming Using Async/Await in C#

New to asynchronous programming? Learn what it’s about, how to use the async and await keywords, avoid deadlock pitfalls and refactor blocking C# code.

The async and await keywords were introduced in C## to make asynchronous programming on the .NET platform easier. These keywords have fundamentally changed how code is written in most of the C## ecosystem. Asynchronous programming has become mainstream, and modern frameworks such as ASP.NET Core are fully asynchronous.

Having such an impact on the C## ecosystem, asynchronous programming proves to be quite valuable. But what is asynchronous programming in the first place?

This article is going to introduce asynchronous programming, show usage of async and await keywords, talk about the deadlock pitfall and finish with some tips for refactoring blocking C## code with these keywords.

Let’s start with terminology.

Concurrent vs Parallel vs Asynchronous

What are the differences between these three terms? All of them are applications of multi-threading, their definitions overlap, and they are often used interchangeably. That’s why the terminology for implementations that leverage multi-threading can be confusing.

We’ll go through the nuances between these terms, so that we can come up with a clear definition for asynchronous programming.

Let’s assume a GUI application as an example.

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